%0 Journal Article %A Peter H. Ritchken %A Harvey M. Salkin %T Safety first selection techniques for option spreads %D 1983 %R 10.3905/jpm.9.3.61 %J The Journal of Portfolio Management %P 61-67 %V 9 %N 3 %U https://jpm.pm-research.com/content/iijpormgmt/9/3/61.full.pdf